The Institute of Medicine’s Forum on Global Violence Prevention will held a 2-day public workshop on October 29-30, 2015 to explore the cultural and social norms that underlie the acceptance of violence, with a particular focus on violence against women across the lifespan, violence against children, and youth violence. The workshop panels will focus on the characteristics, variations, and determinants related to social and cultural norms in this context; what is known about the effectiveness of efforts to alter those norms in order to prevent and mitigate such violence; and the role of multiple sectors and stakeholders in its prevention.